As a driver of my donor Turbo Coupe for over 10 years I had come to like the seats in the car. Thus, it was my intention to put them into my Pinto. However, my first attempt was rather disappointing.
Though I'm only 6 feet tall I am long waisted and sitting down I'm about as tall as a person who is 6'4". My immediate issue was my head brushing across the headliner. I tried setting the seat back so it came off the seat pads and into the lower floorpan, but it still didn't work for me.
While it meant giving up the power seat, I tried the seat tracks from the Pinto. Surprise! They actually worked. In fact, this probably rates right up there with the Turbo Coupe throttle cable that seemed designed exactly for the engine swap.
So, if anyone is interested you don't have to drill the floor at all. Remove the Turbo Coupe tracks. At the rear bolting position you will see four bolt holes. I simply used the fourth hole up from the bottom to install the Pinto tracks at the rear. It doesn't look like the hole is threaded, but the bolt went right in and tightened down. So, maybe it is cutting threads???
You will notice that there is no bolt hole at the front, BUT there is a dimple in the metal. It makes a great center punch to drill the required hole (sorry, no dimple in the picture. I had already drilled the hole). Just drill the hole slightly oversize for the bolt to pass through and use a nut to hold it. No measuring, how easy can it get?
Use the Turbo Coupe bolts in the rear (metric) because they worked fine in the existing hole. However, you probably want to use the American Pinto bolts in the front simple because your more likely to have the needed nut.
Carry the seat over to the car and marvel that the holes all line up. Wow, you didn't have to measure, the two holes that you needed to drill already had a center punch mark and the Pinto tracks installed on the Turbo Coupe seats they are the right width for the Pinto floorboard holes! Sounds like a Billy Mays infomercial! Adjust seat as desired and drive.
Tom